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Impact of extinction coefficient of phosphor on thermal load of color conversion elements of phosphor converted LEDs

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Journal of Rare Earths 2014年第3期32卷 201-206页

作者： F.P.Wenzl P.Fulmek C.Sommer S.Schweitzer W.Nemitz P.Hartmann P.Pachler H.Hoschopf F.Schrank G.Langer J.Nicolics Institute for Surface Technologies and Photonics Joanneum Research Forschungsgesm.b.H. Franz-Pichler Stra?e 30 A-8160 Weiz Austria Institute of Sensor & Actuator Systems Vienna University of Technology Tridonic Jennersdorf GmbH Technologiepark 10 A-8380 Jennersdorf Austria Austria Technologie & Systemtechnik AG Fabriksgasse 13 A-8700 Leoben Austria

Besides their direct impact on the respective correlated color temperature, the extinction coefficient and the quantum effi- ciency of the phosphor also have tremendous impact on the thermal load of the color conversion elements of phosphor converted LEDs under operation. Because of the low thermal conductivity of the silicone matrix in which the phosphor particles are typically embedded, the by far highest temperatures within the LED assembly are reached within the color conversion element. Based on a combined optical and thermal simulation procedure we show that in particular a larger value for the extinction coefficient might have a beneficial impact on the resulting thermal load.

关键词： light-emitting diode color conversion phosphor rare earths

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Recognizing Breast Cancer Using Edge-Weighted Texture Features of Histopathology Images

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Computers, Materials & Continua 2023年第10期77卷 1081-1101页

作者： Arslan Akram Javed Rashid Fahima Hajjej Sobia Yaqoob Muhammad Hamid Asma Arshad Nadeem Sarwar Department of Computer Science and Information Technology Superior UniversityLahore54000Pakistan MLC Lab Maharban HouseHouse#209Zafar ColonyOkara56300Pakistan Information Technology Services University of OkaraOkara56300Pakistan Department of CS&SE International Islamic UniversityIslamabad44000Pakistan Department of Information Systems College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh11671Saudi Arabia Department of Computer Science University of OkaraOkara56300Pakistan Department of Statistics and Computer Science University of Veterinary and Animal SciencesLahorePunjab54000Pakistan School of Biochemistry and Biotechnology University of the PunjabLahore54000Pakistan Department of Computer Science Bahria UniversityLahore CampusLahore54600Pakistan

Around one in eight women will be diagnosed with breast cancer at some *** patient outcomes necessitate both early detection and an accurate *** images are routinely utilized in the process of diagnosing breast *** proposed in recent research only focus on classifying breast cancer on specific magnification *** study has focused on using a combined dataset with multiple magnification levels to classify breast cancer.A strategy for detecting breast cancer is provided in the context of this *** image texture data is used with the wavelet transform in this *** proposed method comprises converting histopathological images from Red Green Blue(RGB)to Chrominance of Blue and Chrominance of Red(YCBCR),utilizing a wavelet transform to extract texture information,and classifying the images with Extreme Gradient Boosting(XGBOOST).Furthermore,SMOTE has been used for resampling as the dataset has imbalanced *** suggested method is evaluated using 10-fold cross-validation and achieves an accuracy of 99.27%on the BreakHis 1.040X dataset,98.95%on the BreakHis 1.0100X dataset,98.92%on the BreakHis 1.0200X dataset,98.78%on the BreakHis 1.0400X dataset,and 98.80%on the combined *** findings of this study imply that improved breast cancer detection rates and patient outcomes can be achieved by combining wavelet transformation with textural signals to detect breast cancer in histopathology images.

关键词： Benign and malignant color conversion wavelet domain texture features xgboost

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Alleviating the crosstalk effect via a fine-moulded light-blocking matrix for colour-converted micro-LED display with a 122% NTSC gamut

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Light(Advanced Manufacturing) 2022年第3期3卷 197-204页

作者： Yongming Yin Zhiping Hu Muhammad Umair Ali Miao Duan Yongwei Wu Ming Liu Wenxiang Peng Jun Hou Dongze Li Xin Zhang Hong Meng School of Advanced Materials Shenzhen Graduate SchoolPeking UniversityShenzhen 518055China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China Tsinghua-Berkeley Shenzhen Institute(TBSI) Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China TCL China Star Optoelectronics Technology Co. Ltd.(CSOT)Shenzhen 518132China

One of the major challenges when fabricating high gamut colour-converted micro-light-emitting diodes(LEDs)displays is severe crosstalk effect among adjacent pixels because of the wide view-angle feature of micro-LED *** this study,potential factors that contribute to the crosstalk effect were systematically *** observed that precisely filling the space between each micro-LED chip with a light blocking matrix(LBM)can be a promising solution to alleviate this *** careful investigations,a press-assisted moulding technique was demonstrated to be an effective approach of fabricating the ***,experimental observations further revealed that residual black LBM on the surface of micro-LEDs severely reduces the brightness,thereby compromising the display *** problem was successfully addressed by employing a plasma etching technique to efficiently extract the trapped ***,a top-emitting blue micro-LED-based backlight fine-moulded with a black LBM was developed and combined with red and green quantum dot colour-conversion layers for full-colour *** colour gamut of our manufactured display prototype can cover as high as 122%that of the National Television Standards Committee.

关键词： Micro-LED Crosstalk effect Quantum dots color conversion Plasma etching Fine-moulding

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Investigation of Quantum Dot color Filter Micro-LED Display

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Photonic Sensors 2024年第1期14卷 40-47页

作者： Xuhui PENG Yang ZENG Sitao HUO Zhenyuan YANG Xiaoping HUANG Qing ZHAO School of Resources and Environment University of Electronic Science and Technology of ChinaChengdu 611731China Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001China Shanghai Tianma Microelectronics Shanghai 201201China

In this work,we present the investigation of the quantum dot color filter(QDCF)micro-light emitting diode(micro-LED)*** and red quantum dot photoresist(QDPR)materials are patterned into a pixelated array and precisely bonded with an all-blue micro-light emitting diode(micro-LED)substrate,forming a red,green,and blue(RGB)full color display through color conversion.A few factors that influence the achievable color gamut are further *** resulting 1.1-inch 228-pixels per inch(ppi)display demo shows the good *** findings in this paper pave a way to the future industrialization of the micro-LED display.

关键词： Quantum dot color filter(QDCF) color conversion micro-light emitting diode(micro-LED) color gamut

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